|Publication number||US7949296 B2|
|Application number||US 12/360,331|
|Publication date||May 24, 2011|
|Filing date||Jan 27, 2009|
|Priority date||Jan 26, 2001|
|Also published as||US7653385, US8260191, US20020102968, US20090170423, US20110217919|
|Publication number||12360331, 360331, US 7949296 B2, US 7949296B2, US-B2-7949296, US7949296 B2, US7949296B2|
|Inventors||Brian L. Arend, Alfredo E. Gonzalez, Charles I. Cook|
|Original Assignee||Qwest Communications International, Inc.|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (17), Non-Patent Citations (12), Referenced by (11), Classifications (16), Legal Events (1)|
|External Links: USPTO, USPTO Assignment, Espacenet|
This application is a continuation of co-pending U.S. Pat. application Ser. No. 09/770,551, filed Jan. 26, 2001 by Arend et al. and entitled “Wireless Telecommunication Signal Inhibition.”
The present invention relates to inhibiting operations of wireless transceivers such as telephones.
The use of wireless communication devices, such as cellular and PCS telephones, pagers, personal digital assistants (PDAs), and the like, have become ubiquitous. Such devices offer many advantages including the ability to establish communication at almost any location and at almost any time. Thus, wireless users can talk with friends and colleagues, receive updates on the weather or the stock market, send and receive e-mail, receive audible alarms for important events, and many other useful activities.
While wireless communication undoubtedly brings many benefits, there are occasionally some drawbacks. The ringing of a wireless telephone is an unwanted event at public performances such as movies, plays, lectures, concerts, and the like. Portable wireless devices may create a distraction to learning in schools. Operation of a wireless handset may create a hazardous distraction to vehicle operators. Operation of various wireless devices may also interfere with the safe operation of commercial aircraft.
The present invention inhibits wireless telecommunications within a limited region by generating a noise signal within a frequency range of the wireless telecommunications and broadcasting the noise signal into the limited region.
A system for inhibiting wireless communication within a limited region is provided. The system includes a radio frequency noise generator generating a noise signal within a frequency range of the wireless telecommunication. At least one antenna broadcasts the noise signal into the region. Control logic initiates or suspends broadcasting of the noise signal based on at least one control input.
In an embodiment of the present invention, the radio frequency noise generator includes a wide band noise source generating a wide band noise signal. A band pass filter accepts the wide band noise signal and produces the noise signal within the frequency range of wireless telecommunication. If the wireless telecommunications is through spread spectrum, the noise signal is generated across substantially the entire spectrum.
In another embodiment of the present invention, the limited region encompasses a public event. The control signal is generated based on a condition occurring at the public event.
In yet another embodiment of the present invention, the limited region is inside of a vehicle, such as an aircraft or an automobile. The control signal may be based on detecting the presence of a telephone in a cradle. The control signal may also be based on detecting at least one condition of the vehicle.
In still another embodiment of the present invention, the system includes a plurality of radio frequency noise generators, each generating a noise signal within a portion of the frequency range of wireless telecommunications. An antenna receives the noise signal from each noise generator. Each antenna has a coverage area. The limited region of telecommunications coverage is formed by overlapping antenna coverage areas.
The above objects and features as well as other objects, features, and advantages of the present invention are readily apparent from the following detailed description of the best mode for carrying out the invention when taken in connection with the accompanying drawings.
A wireless telecommunications inhibition system, shown generally by 30, includes at least one radio frequency noise generator 32 driving at least one antenna 34. Each antenna 34 radiates a low level noise signal cancelling, blocking, interfering, or otherwise inhibiting communication link 27 established between wireless communication device 28 and antenna 24 within limited region 36. Limited region 36 may be defined by an enclosed or partially enclosed structure, such as a building, room, hall, vehicle, arena, stadium, or the like. Limited region 36 may also be a non-enclosed space defined by overlapping regions radiated from more than one antennas 34.
Wireless telecommunications inhibition system 30 includes noise source 38 generating broadband noise 40. Noise source 38 typically includes a device, such as a diode, for generating broadband noise and may also include a broadband amplifier. As will be recognized by one of ordinary skill in the art, there are many other techniques for generating broadband noise 40, such as a white gaussian noise generator, any of which may be used in the present invention. The spectral coverage of broadband noise 40 depends on the spectrum of communications link 27. A sufficient overlap of spectral content between communications link 27 and broadband noise 40 must be substantial enough to inhibit reception of communications link 27.
Band pass filter 42 accepts broadband noise 40 and produces filtered noise 44. Filtered noise 44 has at least some components within the frequency range of wireless telecommunications system 20. In one embodiment, filtered noise 44 covers substantially all of the spectrum of a spread spectrum signal transmitted by antenna 24. In another embodiment, filtered noise 44 covers only a portion of the frequency range used by wireless telecommunications system 20. In yet another embodiment, a plurality of filtered noise signals 44 having differing spectral components are transmitted into limited region 36. Amplifier 46 amplifies filtered noise 44 to produce noise signal 48 broadcast by antenna 34.
Band pass filter 42 shapes broadband noise 40 to match the bands of operation of wireless communications device 28 to interfere with the operation of wireless communications device 28 within telecommunications system 20. Band pass filter 42 may also shape broadband noise 40 to target specific technologies, such as wideband or narrowband, TDMA or CDMA, and the like.
Wireless telecommunications inhibition system 30 includes control logic 50 accepting one or more control inputs 52 and generating one or more control outputs 54 to radio frequency noise generator 32. Control outputs 54 control one or more operating parameters of radio frequency noise generator 32 including the on/off state, output noise power, noise spectral components, and the like.
Control logic 50 generates control outputs 54 based on the application for wireless telecommunications inhibition system 30 and on control inputs 52. For example, limited region 36 might be defined as an area for viewing, listening to, or participating in a public event. Control logic 50 may activate wireless telecommunications inhibition system 30 based on a manual switch. Noise signal 48 may also be generated by dimming house lights, turning on microphones, running a projector, opening curtains, or other triggering events. Control inputs 52 may be generated by clocks, timers, electric eyes, or other sensors. Control inputs may also be generated remotely by a variety of means including via infrared link, sonic link, ultrasonic link, radio link, wired link, or the like.
In another embodiment, limited region 36 might include the interior of a commercial airliner. Noise signal 48 may be generated prior to taxiing, as a reminder to turn off all wireless devices 28 which may interfere with operations of the aircraft.
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While embodiments of the invention have been illustrated and described, it is not intended that these embodiments illustrate and describe all possible forms of the invention. Rather, the words used in the specification are words of description rather than limitation, and it is understood that various changes may be made without departing from the spirit and scope of the invention.
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|Citing Patent||Filing date||Publication date||Applicant||Title|
|US8260191||May 13, 2011||Sep 4, 2012||Qwest Communications International Inc.||Wireless telecommunications signal inhibition|
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|International Classification||H04M1/60, H04W4/06, H04K3/00, H04W48/02|
|Cooperative Classification||H04K3/43, H04K2203/34, H04K3/42, H04M1/6041, H04K3/415, H04K2203/22, H04W4/06, H04W48/02|
|European Classification||H04W48/02, H04K3/42, H04K3/41B|